Rails how to form post one object on another object view?

I have dispute object that belongs to order and i would like to create it on orders view so: How can create a object on another object page?

the route is:

dispute_sent_order_path(@order), :html => {:method => :post} do |f| %>

 resources :orders, only: [:index, :update, :destroy] do

    member do

get :dispute
post :dispute_sent
put :dispute_done

end
end




 def dispute
   @order = current_user.orders.find(params[:id])
    if current_user.address.blank?
      redirect_to edit_user_path

      flash[:error] = 'error'
    else
      @dispute = Dispute.new
    end
  end 


def dispute_sent

@order = current_user.orders.find(params[:id])
  if   current_user == @order.buyer
    dispute = @order.dispute.nil? ? Dispute.new : @order.dispute
     params[:status] == 'Open'
    if dispute.save
      flash[:success] = 'hooray'
    end
  else
    flash[:error] = 'Error'
  end
  redirect_to :back
end
end